[artist id="3061469"]Lady Gaga[/artist] might have 7 million followers on Twitter, but [artist id="3187077"]Justin Bieber[/artist] is hot on the pop star's designer heels. He just crossed the 6 million-followers mark on Twitter, thanks to his dedicated fans.

"6 MILLION OF THE GREATEST FANS ON EARTH ON TWITTER!!!! THANK U," he tweeted after reaching the milestone. "This is crazy...My Hometown only has 30,000 people total! NUTS."

So how did his rabid fanbase help the pop star reach that mark? With a Twitter trend, obviously. On Tuesday morning (November 9), the hashtag #6millionbeliebers became a top trend on the social-networking site.

Gaga celebrated her own Twitter achievement this past weekend. "HOLY HOOKER 7million little monsters!" Gaga tweeted Saturday. "Thank u for all the amazing messages about BORN THIS WAY. They inspire me and keep me strong."

This isn't the first time Gaga and Bieber have faced off in the world of Internet fame. In late October, Gaga reached 1 billion YouTube streams before the pint-size pop star. "We reached 1 Billion views on youtube little monsters!" she tweeted at the time. "If we stick together we can do anything. I dub u kings and queens of youtube! Unite!"

It helps that both artists have a number of YouTube's all-time most-viewed music clips, with Gaga's "Bad Romance" piling up 303 million views, "Just Dance" further back at 125 million views, "Alejandro" with 99 million and "Telephone" with 91 million. As for Bieber, his smash "Baby" is the most-watched video ever on YouTube with 380 million views, while his "Never Let You Go" has 99 million and "Never Say Never" 104 million.

Do you think Bieber will hit the 7 million mark? Let us know in the comments!